External earth fault loop tt system

[brightspark2010]

Evening all could anyone please tell me the the maximum ze for tt systems the jobs entail Rec cut out fuse bs88 16a to feed 1x 30 ma rcd fuse spur for feeding socket outlet what should the max ze be please

 

[Engineer54]

Max 1667 ohms is so no more than 50 volts can appear on earthed metalwork.
Anything above 200 ohms is classed as unstable and likely to increase in frozen or dry soil conditions.

As has been said, fine while the RCD is functioning!!! lol!! You'd need to go down a lot more than that for a stable system, ...believe me!! Your ground/soil conditions would be absolute crud, to go down any depth and end up with just 200 ohms!! lol!!

 

[linfield-sparky]

What does Ra stand for?

 

[trev]

What does Ra stand for?

Are you serious?

 

[linfield-sparky]

No it was a joke

 

[linfield-sparky]

But just tell me anyway so I can test u that u know.

 

[DPG]

I sense that this post is about to go down the pan. Daz

 

[Elmer BeFuddled]

Ra is Like Re and Ri. Religious education and Religious instruction. Ra is Religious arithmetic.

 

[Des 56]

This Ra question could get to be extra long

Reconsider Asking
Reptile Asphyxiation
Reindeer Antlers

 

[Stroppy]

Don't be silly, we all know its Resistance of Aerth. Its one of these misspellings which has persisted through the ages, such as the Americans' "aluminum."

 

[SPARTYKUS]

It's also a scary noise lions make.


"Ra"

 

[trev]

It's also a song by Todd Rundgren's Utopia, it features on an album of the same name.

 

[Geordie Spark]

Are you serious?

Hah!! ............... now that looks to me like YOU don't know either !!!!

 

[Stroppy]

Surprised no-one's mentioned the Egyptian sun-god yet.

 

[trev]

Hah!! ............... now that looks to me like YOU don't know either !!!!

Divvent yee consorn yasell bonny lad cos aa knaa

 

[Geordie Spark]

Divvent yee consorn yasell bonny lad cos aa knaa

Howay then ............. tellisman!!!